package com.zhm.springcloud.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.zhm.springcloud.entities.CommonResult;
import com.zhm.springcloud.entities.Payment;
import com.zhm.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * Date： 2021/3/20 20:11
 *
 * @author ZHM
 */
@RestController
@Slf4j
public class CircleBreakerController {

    public static final String SERVICE_URL = "http://nacos-payment-provider";
    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
    //@SentinelResource(value = "fallback") //没有配置
    //@SentinelResource(value = "fallback", fallback = "handlerFallback") //fallback只负责业务异常
    //@SentinelResource(value = "fallback", blockHandler = "blockHandler") //blockHandler 只负责sentinel控制台配置违规
    @SentinelResource(value = "fallback", fallback = "handlerFallback", blockHandler = "blockHandler")
    public CommonResult<Payment> fallback(@PathVariable Long id) {
        CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/" + id, CommonResult.class, id);
        if (id == 4) {
            throw new IllegalArgumentException(" IllegalArgumentException,非法参数异常...");
        } else if (result.getData() == null) {
            throw new NullPointerException("NullPointerException, 该ID没有对应记录,空指针异常");
        }
        return result;
    }

    //本例是fallback
    public CommonResult handlerFallback(@PathVariable Long id, Throwable e) {
        Payment payment = new Payment(id, "null");
        return new CommonResult<>(444, "兜底异常handlerFallback, exception内容" + e.getMessage(), payment);
    }

    //本例是blockHandler
    public CommonResult blockHandler(@PathVariable Long id, BlockException blockException) {
        Payment payment = new Payment(id, "nul1");
        return new CommonResult<>(445, "blockHandler-sentine1限流,无此流水: blockException " + blockException.getMessage());
    }

    //=============OpenFeign==========================

    @Resource
    private PaymentService paymentService;

    @GetMapping(value = "/consumer/openfeign/{id}")
    @SentinelResource(value = "fallback", fallback = "handlerFallback", blockHandler = "blockHandler")
   // @SentinelResource(value = "openfeign", blockHandler = "blockHandler")
    public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id) {
        CommonResult<Payment> result = paymentService.paymentSQL(id);

        if (id == 4) {
            throw new IllegalArgumentException("openfeign------ IllegalArgumentException,非法参数异常...");
        } else if (result.getData() == null) {
            throw new NullPointerException("openfeign--------- NullPointerException, 该ID没有对应记录,空指针异常");
        }

        return result;
    }

}
